Spam, in the context of computer games, refers to the rapid, repeated use of the same item or action.
Chat spamming is the repetition of a word or line typed out by a player using a game's chat system. As most games have some form of text messaging built for in-game communication, there is little to stop a player from flooding a server with text. Some servers enforce rules regarding text spamming, possibly resulting in players being kicked or banned. Some games allow text to be turned off or mute the player after a limited number of messages at the same time, hence nullifying this form of spamming.